When Mr. Robot was talking to Darlene, Elliot was out of the picture. Then when Mr. Robot backed up, Elliot came in and we no longer see Mr. Robot.We don't see both of them (Elliot and Mr. Robot) communicate with the others AT THE SAME TIME, it's always ONLY one of them, and even when both of them are in the picture, the others interact only with Elliot and ignore Mr. Robot, as if he doesn't exist.